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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '091e4c865e77c3e1272bcd7d7dc0c6110949a4a01b4475e7a46dea34e57cb34c' 
  AND token = 'wNILey2F9qKgCkMk+dAfTuG6vBm03v9iQSC6vSJ/30M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}